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- Title
Thermal capacity, diffusion, and conductivity of Nd<sub>1− x </sub>Sr<sub>x</sub>Mno<sub>3</sub> ( x = 0.45 and 0.5) manganites.
- Authors
Gamzatov, A. G.; Aliev, A. M.; Abdulvagidov, Sh. B.; Batdalov, A. B.; Gorbenko, O. Yu.
- Abstract
Temperature dependences (77–300 K) of the thermal capacity, diffusion, and conductivity are investigated for the Nd 0.5 Sr 0.5 MnO 3 and Nd 0.55 Sr 0.45 MnO 3 polycrystalline samples. The examined characteristics show anomalous behavior in the magnetic phase transition and transition to the charge-ordered state. It is demonstrated that the main reason for a sharp decrease in the thermal conductivity during Nd 0.5 Sr 0.5 MnO 3 transition into the antiferromagnetic charge-ordered state is a change in the phonon spectrum caused by the lattice compression. A temperature dependence of the free phonon path is calculated for the examined temperature interval based on the thermal diffusion obtained and the literature data on the sound propagation velocity.
- Subjects
THERMODYNAMICS; PROPERTIES of matter; METALLIC composites; CRYSTALLINE interfaces; SPECTRUM analysis; PHYSICS research
- Publication
Russian Physics Journal, 2007, Vol 50, Issue 4, p383
- ISSN
1064-8887
- Publication type
Article
- DOI
10.1007/s11182-007-0053-0